在python中，使用xml，如何仅在存在另一个值时更改一个值

我有以下xml文件：

<?xml version="1.0" encoding="UTF-8"?>
<ABCDE>
    <global>
...
    </global>
    <rf>
        <r1> 
            <type> 1 </type>
            <location> /root/1 </location>
            <tag> cloud </tag>
            <src_path> tmp/ggg </src_path>
        </r1>
        <r1>
            <type> 1 </type>
            <location> /root/1 </location>
            <tag>lll</tag>
            <src_path> tmp/lll </src_path>
        </r1>

...
1.
/根/1
云彩
tmp/ggg
1.
/根/1
微光
tmp/lll

当ABCDE/rf/src_路径为tmp/lll时，我需要标记为“xxx”

谢谢，

您想更改

lll吗
def update_tag(file,test_tag,new_tag):
tree=parse_xml_with_remarks(file)
root=tree.getroot()
for rf in root.findall('rf'):
    for r1 in rf.findall('r1'):
        src_path = r1.findall('src_path')
        for sp in src_path:
            src_orig = sp.text
            src = sp.text.strip().split(".git")[0].replace("/", " ").split()[-1]
            if src == test_tag:
                # yes must repeat the tree parsing
                parseTree=parse_xml_with_remarks(file)
                newstr1="./rf/r1[src_path='"+src_orig+"']"
                right_r1=parseTree.find(newstr1)
                right_r1.find("./tag").text = new_tag
                parseTree.write(file)
                print ("The r1 with '{}' in the src_path tag is now using the '{}' tag tag in the file '{}'".format(test_tag,new_tag,file))
            else:
                print("{} is not {}, skipping file {}".format(src,test_tag,file))